Yes, finding the time to cache can be an issue. It will be the issue regarding finding this cache. The related website will be helpful.
The final location of the cache is N 39 47.ABC W 075 31.DEF. To find the values of A, B, C, D, E, and F start by assuming that the time at the posted coordinates on February 12, 2015 is 5:00 PM EST. Use a 12 hour clock. Then answer the following questions:
A - What is the hour in Canberra, Australia?
B - What is the hour in Asunción, Paraguay?
C - What is the hour in Port Moresby, Papua New Guinea?
D - What is the hour in Managua, Nicaragua?
E - What is the hour in Nairobi, Kenya?
F - What is the hour in São Paulo, Brazil?
You can check your answers for this puzzle on GeoChecker.com.